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Only 10% of Republicans who responded said they do not own a gun, while 66% of Democrats said they are not gun owners.[...]

36 Republicans in the House refused to say whether they own guns; 11 Democrats refused to say. Across both the House and Senate, an additional 161 lawmakers did not return repeated phone calls, e-mails and requests for comment - 97 of those were Republicans.

Click here to view a table with full results for all 535 members of Congress: political party, state, gun ownership status, and National Rifle Association grade. Both Iowa Senators Tom Harkin and Chuck Grassley are gun owners, but Grassley has an A grade from the NRA while Harkin has an F.

The offices of Bruce Braley (IA-01) and Tom Latham (IA-03) did not respond to USA Today's calls on this topic. The NRA gives an F to Braley, a Democrat, and an A to Latham, a Republican.

Democrat Dave Loebsack (IA-02) does not own a gun and has an F from the NRA.

Republican Steve King (IA-04) is a gun owner and has the only A+ NRA rating in the Iowa delegation.

Here are links to more details about each Iowan's voting record on federal gun control issues: